Transcriber's Notes:
p. 31 "The pollen is thus pushed against the projecting stigma, as
shown at Fig. 3, and thus, one by one, the flowers are
cross-sterilized." changed to "The pollen is thus pushed against the
projecting stigma, as shown at Fig. 3, and thus, one by one, the
flowers are cross-fertilized."
p. 209 Fig. 1 and Fig. 2 which are referenced on this page are not
found in the original document.